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Three-component VSP wave field separation method

A wave field separation, three-component technology, applied in seismic signal processing and other directions, can solve problems such as waveform distortion, mixing, and low frequency, and achieve the effect of overcoming mixing and improving fidelity.

Active Publication Date: 2008-08-20
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0002] The existing three-component VSP wave field separation methods, such as median filtering, velocity filtering, and F-K filtering, are all multi-channel filtering methods, which have defects such as wave mixing, low frequency, and waveform distortion; the separated wave field imaging and information extraction There are adverse effects

Method used

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  • Three-component VSP wave field separation method

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Embodiment Construction

[0050] attached figure 1 Schematic diagram of the process of the two-step three-component VSP wavefield separation method. In the figure, Dp, Ds, Up and Us denote down-going longitudinal wave, down-going shear wave, up-going longitudinal wave and up-going shear wave, respectively.

[0051] After the polarization filtering step, the downgoing longitudinal wave Dp and the upgoing shear wave Us are retained in the wave field, or a group of the downgoing transverse wave Ds and the upgoing longitudinal wave Us are retained;

[0052] After the direction filtering in the two-step method, the up-going shear wave Us or the down-going longitudinal wave Dp can be completely separated; the down-going shear wave Ds or the up-going longitudinal wave Up can also be completely stripped from the wave field.

[0053] attached figure 2 Schematic diagram of the principle of polarization filtering (downgoing wave) based on ray tracing. In the figure, S represents the seismic source, W represen...

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Abstract

The invention uses the characteristics that various wave fields have various polarization directions and various transmission directions on three-component VSP record, and realizes high fidelity separations of various wave fields with two-step method. At first, separating the complex wave field records into simple wave field records, which is based on rays tracking polarization filtering, for realizing part separation; then using the characteristic that various wave fields have opposite transmitting directions in simple wave field record, and realizing total separation of wave field through directional filter. The invention uses three-component VSP wave field to separate, which has the merit of high fidelity, and is suitable for every kinds of high precision VSP treatment.

Description

technical field [0001] The invention utilizes the difference between the polarization directions and propagation directions of different wave fields to realize high-fidelity separation of different wave fields in three-component wave field records through the combination of ray tracing, polarization filtering and direction filtering, and belongs to the field of seismic digital signal processing. Background technique [0002] The existing three-component VSP wave field separation methods, such as median filtering, velocity filtering, and F-K filtering, are all multi-channel filtering methods, which have defects such as wave mixing, low frequency, and waveform distortion; the separated wave field imaging and information extraction There are adverse effects. Contents of the invention [0003] Aiming at the shortcomings of the existing three-component VSP wavefield separation methods, the present invention realizes high-fidelity separation of different wavefields in three-comp...

Claims

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Application Information

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IPC IPC(8): G01V1/28G01V1/36
Inventor 张山
Owner CHINA PETROLEUM & CHEM CORP
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